Too many nested blockquotes cause error: SystemStackError: stack level too deep

[FlameWerx]

Rendering text with too many nested blockquote characters > is failing with a SystemStackError: stack level too deep error.

I had a user generated text which included about 1600 > characters followed by some text. I believe that the user expected the result would be 1600 literal > characters and not a 1600 deep nested blockquote.

Can we set a limit to the depth that rendering will be attempted to?

[gjtorikian]

I'm unable to repro this:

text = '>' * 1600 + 'so i says to mabel i says'
CommonMarker.render_html(text)

yields

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ote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<blockquote>\n<p>so i says to mabel i says</p>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n</blockquote>\n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How are you interacting with Commonmarker?

[FlameWerx]

EXTENSIONS = [:strikethrough]
PARSE_OPTIONS = [:DEFAULT, :STRIKETHROUGH_DOUBLE_TILDE]
RENDER_OPTIONS = [:DEFAULT, :HARDBREAKS]

doc = CommonMarker.render_doc(text, PARSE_OPTIONS, EXTENSIONS)
renderer = new CommonMarker::HtmlRenderer(options: RENDER_OPTIONS, extensions: EXTENSIONS)
renderer.render(doc)

[gjtorikian]

@kivikakk Curious to get a second opinion here. On the one hand, I get it—this looks bad, it's a crash, etc etc.

But on the other hand, do we want to start sanitizing user inputs? If we do it here, we'd potentially have more issues in the future. I don't really want to anticipate any kind of input issues--I think users of the library should make sure they're not feeding garbage into the renderer.

To be clear, this is in the Ruby render code, not the C code. Users of the library can always catch the exception. Maybe the best compromise is to wrap errors like this into some standard (e.g. CommonMark::RenderError), so that consumers can try/catch one error type and handle it themselves.

[kivikakk]

I don't really want to anticipate any kind of input issues--I think users of the library should make sure they're not feeding garbage into the renderer.

I agree. I don't think we should try to guard against any and every kind of input; we are not trying to abstract every possible thing.

I do think it would be kind to our users to translate this into a nicer error, although we run the risk of throwing away potentially usable information. (SystemStackError seems more actionable than CommonMarker::RenderError, but then again, I don't think people are likely to want to programmatically handle stack overflows, so it likely doesn't matter so much.)

[FlameWerx]

@kivikakk @gjtorikian

I don't really want to anticipate any kind of input issues--I think users of the library should make sure they're not feeding garbage into the renderer.

I agree. I don't think we should try to guard against any and every kind of input; we are not trying to abstract every possible thing.

If this issue isn't prevented at the library level, it means that users of the library will be required to guard against not just garbage input but also against valid markdown input which causes a stack overflow. I don't think that user code should be expected to understand and parse markdown in order to safely use a library that understands and parses markdown, and on top of that be expected to understand which valid markdown has the potential to cause a stack overflow in the library.

But instead of the library trying to guard against user input, what about having a configuration option for maximum nesting depth? I've seen this done elsewhere for nested markdown lists, so maybe the configuration option should be a global nesting limit rather than specifically for nested blockquotes.

[gjtorikian]

Unsure if this is a problem still in 1.0.0, please reopen with a test case if it's so.